chore: checkpoint before Python removal

vendor/wit-parser/tests/ui/world-diamond.wit

@@ -0,0 +1,23 @@
+package foo:foo;
+
+interface shared-items {
+  type foo = u32;
+}
+
+interface i1 {
+  use shared-items.{foo};
+
+  a: func() -> foo;
+}
+
+interface i2 {
+  use shared-items.{foo};
+
+  a: func() -> foo;
+}
+
+world the-world {
+  import i1;
+  import i2;
+  import a: func();
+}